Danny Mills believes that a small tactical change by Marcelo Bielsa Helder Costa at Leeds United has taken the shackles.
The winger showed one of his best performances this season when Leeds defeated Blackburn Rovers 2-1 on Saturday to sustain the championship bid.
Costa has struggled to make a real impact on the whites after being taken over by Wolverhampton Wanderers, and has been criticized by experts.
But he was much more upbeat about Rovers on Elland Road and Mills thinks it's just a small improvement from Bielsa.
"It was more of a 3-4-3 formation, a little bit better," said Leeds' former England defender and England Football Insider.
"More or less with full-backs, of course, this gives Costa the opportunity to play a bit higher and develop the pace and ability to defend – not just as a full-back.
"Sometimes it's these little changes, these little tactical changes that can often help a player free you from your defensive tasks and give you freedom for the future."
Costa has been given a seasonal loan to Leeds by Wolves this summer and will make its record purchase when the £ 15m move is final next year.
When Bielsa was asked after the game after his verdict on Costa, he said: "In the second half better than in the first.
"He had the capacity for imbalance he showed. He must have more than just opportunities than the ones he has in the game. "